高压电缆缓冲层烧蚀的成因分析严有祥1，徐子峻1，尤天鹏2，周文俊2，林智雄1，刘彦琴3（1.国网福建省电力有限公司厦门供电公司，福建厦门361000；2.武汉大学电气与自动化学院，武汉430072；3.国网四川省电力公司成都供电公司，成都610041）摘要：在近10年全国的电缆事故中已发现大量的缓冲层烧蚀问题，为探索烧蚀产生因素，文中基于压力的影响建立了数学模型，考虑水汽的渗入对模型的影响，并对多组产生缓冲层现象的电缆进行了分析。计算和仿真结果表明，电缆阻水带因电缆绝缘本体重力和电缆敷设过程中的外力影响，会在1mm2接触点上产生3.75A的集中电流，使得在阻水带和铝套接触处温度升高到176℃，而铝和聚丙烯酸钠在80℃时会发生反应生成氧化铝粉末，产生阻水带上的“白斑”；而绝缘屏蔽层上相同的电流长时间作用，则会引起绝缘屏蔽的老化。关键词：电力电缆；缓冲层；烧蚀；水解反应CauseAnalysisofBufferLayerAblationinHighVoltageCableYANYouxiang1，XUZijun1，YOUTianpeng2，ZHOUWenjun2，LINZhixiong1，LIUYanqin3（1.XiamenPowerSupplyCompanyStateGridFujianElectricPowerCompany，FujianXiamen361000，China；2.SchoolofElectricalEngineeringandAutomation，WuhanUniversity，Wuhan430072，China；3.ChengduPowerSupplyCompanyStateGridSichanElectricPowerCompany，Chengdu610041，China）Abstract:AlargenumberofbufferlayerablationproblemshavebeenfoundintheaccidentsofcableinChinainre⁃cent10years.Inordertoexplorethefactorsthatcauseablation,amathematicalmodelissetupbasedontheinflu⁃enceofpressure.Theinfluenceofofwatervaporinfiltrationonthemodelisconsideredandthemultiplesetsofca⁃blescausingbufferlayerphenomenonisanalyzed.Thecalculationandsimulationresultsshowthatthewaterblockingtapeofthecablecan,duetotheinfluenceofthegravityofcableinsulationproperandtheexternalforceduringthelayingprocess，generateaconcentratedcurrentof3.75Aat1mm2contactpoint，causingthetemperatureatthecon⁃tactpointbetweenthewaterblockingtapeandthealuminumsheathtoriseupto176℃.While,thealuminumandso⁃diumpolyacrylatewillreactat80℃togeneratealuminapowder,resultingin“whitespots”onthewaterblockingtape.Thelongtermoperationofthesamecurrentontheinsulationshieldlayercanleadtotheinsulationsh...
